/*
 * Copyright 2019 Alfresco, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.cloud.services.modeling.service;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.activiti.cloud.modeling.api.ModelExtensionsValidator;
import org.activiti.cloud.modeling.api.ModelType;
import org.activiti.cloud.services.modeling.validation.extensions.ExtensionsModelValidator;

/**
 * Service for managing {@link ModelExtensionsService}
 */
public class ModelExtensionsService {

    private final Map<String, List<ModelExtensionsValidator>> modelExtensionsValidatorsMapByModelType;

    public ModelExtensionsService(Set<ModelExtensionsValidator> metadataValidators,
                                  ExtensionsModelValidator extensionsModelValidator,
                                  ModelTypeService modelTypeService) {
    this.modelExtensionsValidatorsMapByModelType = metadataValidators.stream()
        .filter(validator -> validator.getHandledModelType() != null)
        .collect(Collectors.groupingBy(validator -> validator.getHandledModelType().getName()));

    // Add the generic JSON extensions schema to all the available model types except PROCESS
    modelTypeService.getAvailableModelTypes().stream().forEach(modelType ->
                this.modelExtensionsValidatorsMapByModelType.put(modelType.getName(), this.getExtensionValidators(modelType, extensionsModelValidator)));
  }

    private List<ModelExtensionsValidator> getExtensionValidators(ModelType modelType, ExtensionsModelValidator extensionsModelValidator) {

        if(modelType.getName().equals(org.activiti.cloud.modeling.api.ProcessModelType.PROCESS)) {
            return this.modelExtensionsValidatorsMapByModelType.get(modelType.getName());
        }

        if (this.modelExtensionsValidatorsMapByModelType.containsKey(modelType.getName())) {
            return Stream.concat(this.modelExtensionsValidatorsMapByModelType.get(modelType.getName()).stream(),
                Stream.of(extensionsModelValidator)).collect(Collectors.toList());
        }

        return Collections.singletonList(extensionsModelValidator);
    }

    public List<ModelExtensionsValidator> findExtensionsValidators(String modelType) {
        return modelExtensionsValidatorsMapByModelType.get(modelType);
    }
}
